If necessary, our muscles can rely upon an anaerobic (fermentative) pathway to metabolize glucose, but this can only last a short period of time. Why can't our cells survive very long under such anaerobic conditions?
A) Fermentation doesn't extract enough ATP from glucose to sustain our energy-craving cells.
B) Anaerobic conditions create a "carbon dioxide debt" that must be repaid before cells die.
C) The ethyl alcohol that builds up in muscles as a result of fermentation is a toxin.
D) Lactic acid causes the cell to die when it's exposed to even lower concentrations.
A
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Dosage compensation leads to a variety of interesting coat color patterns in certain mammals. For instance, a female cat that is heterozygous for two coat color alleles, say black and orange, will usually have the "calico" or mosaic phenotype
Describe the chromosomal basis for the mosaicism (calico) in the female. Explain why chromosomally normal male cats do not show the mosaic phenotype, but XXY male cats can be calico.
The first life on Earth was probably most similar to modern-day
A. bacteria. B. protists. C. Archaeans. D. plants. E. fungi.
When treating an organism with a mutagen, although it is possible that homozygous mutations will occur, it is more likely that most new mutations will be heterozygous or hemizygous
Indicate whether the statement is true or false
Glucose molecules provide energy to power the swimming motion of sperm. In this example, the sperm are changing ________
A) chemical energy into kinetic energy
B) chemical energy into potential energy
C) kinetic energy into potential energy
D) kinetic energy into chemical energy